docs: def wnfild(small, window):
      """
      Fill small gaps between adjacent intervals of a double precision window.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/wnfild_c.html
  
      :param small: Limiting measure of small gaps. 
      :type small: float
      :param window: Window to be filled 
      :type window: spiceypy.utils.support_types.SpiceCell
      :return: Filled Window.
      :rtype: spiceypy.utils.support_types.SpiceCell
      """
      assert isinstance(window, stypes.SpiceCell)
      assert window.dtype == 1
      small = ctypes.c_double(small)
      libspice.wnfild_c(small, ctypes.byref(window))
      return window